Hiking/Outdoor Activites

I am new to outdoor activities, I getting into & reading about hiking, currently I am 268. Are there any tips or good outdoor fall activites that don't involve running like a deer. Does anyone hike in southeastern Michigan where do you go? Does anyone hike period, what are your experinces? S/N my best walk ever has been 3.60 miles for 1:07:00 minutes
http://runkeeper.com/user/587360286/activity/122017610